10 PERCY SLADEN TEUST EXPEDITION. 



A few small eyes are present, and head-glands are fairly well marked. There is no 

 frontal organ. 



15. Lineus corrugatus, Mclnt., 1879. (Plate 1. fig. 7.) 



Locality. Cargados Carajos, 35 fathoms. 



One specimen, 100 mm. long and 8 mm. broad. This agrees with the type in the 

 presence of eyes and the general structure of the body and skin. The only difference 

 that we have been able to discover is that the excretory duct occurs in the hinder 

 mouth-region, while in another specimen of L. corrugatus which we were able to 

 examine the ducts were situated further back. 



16. Lineus orientalis, sp. n. (Plate 1. fig. 3 ; Plate 2. fig. 17.) 

 Locality. Coetivy. 



A single specimen, 170 mm. long and 5 mm. in breadth . 



Colour a brown-green all over, rather paler ventrally, without markings. The 

 oesophageal region is cylindrical, the intestinal region being rather more flattened. 



The epithelium rests on a fine basement-membrane, under which is a well-developed 

 gelatinous layer. The cutis-glands are well developed, especially in the anterior region 

 (PI. 2. fig. 17). 



The vascular system shows a cephalic loop. 



The proboscis is missing. 



The excretory system has a single pair of weU-marked ducts near the hinder end of 

 the system. 



The cephalic slits reach about halfway to the middle line and are not prolonged 

 behind the brain-region, 



A frontal organ and head-glands are present, but there are no eyes. 



17. Cerebratulus multiporatus, sp. n. (Plate 2. fig. 18.) 

 Locality. Wasin, British East Africa (Crossland Coll.). 



A small specimen, colourless when preserved, measuring 53 mm. in length and 25 in 

 breadth. A caudicle is present. 



The epithelium (fig. 18) rests on a distinct basement-membrane, beneath which is a 

 delicate layer of circular muscles. The cutis is feebly developed and the glands, which 

 stain vividly with picric acid, are scanty ; in the postnephridial region, however, the cutis- 

 glands are much more highly developed and form a compact layer. In the oesophageal 

 region the outer longitudinal muscle-layer is about five times as thick as the circular 

 layer, and this again is twice as thick as the internal longitudinal layer. There is no 

 diagonal layer, nor is there a horizontal layer over the mouth. 



Tlie mouth-opening is situated immediately in front of the level of the termination of 

 the cerebral organs. 



The vascular system exhibits a cephalic vascular lacuna. 



The proboscis is small, but contains the usual three layers and muscle-crosses. 



